231931954657 has 4 divisors (see below), whose sum is σ = 249772874260. Its totient is φ = 214091035056.

The previous prime is 231931954643. The next prime is 231931954697. The reversal of 231931954657 is 756459139132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139953802816 + 91978151841 = 374104^2 + 303279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231931954657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231931954598 and 231931954607.

It is not an unprimeable number, because it can be changed into a prime (231931954637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8920459782 + ... + 8920459807.

It is an arithmetic number, because the mean of its divisors is an integer number (62443218565).

Almost surely, 2^231931954657 is an apocalyptic number.

It is an amenable number.

231931954657 is a deficient number, since it is larger than the sum of its proper divisors (17840919603).

231931954657 is a wasteful number, since it uses less digits than its factorization.

231931954657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840919602.

The product of its digits is 6123600, while the sum is 55.

The spelling of 231931954657 in words is "two hundred thirty-one billion, nine hundred thirty-one million, nine hundred fifty-four thousand, six hundred fifty-seven".